package com.atguigu.gateway.config;

import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.BlockRequestHandler;
import com.alibaba.csp.sentinel.adapter.gateway.sc.callback.GatewayCallbackManager;
import com.alibaba.fastjson.JSON;
import com.atguigu.common.exception.BizCodeEnume;
import com.atguigu.common.utils.R;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.reactive.function.server.ServerResponse;
import org.springframework.web.server.ServerWebExchange;
import reactor.core.publisher.Mono;

/**
 * description: 自定义阻塞返回方法
 */
@Configuration
public class SentinelGatewayConfig {

    public SentinelGatewayConfig() {

        GatewayCallbackManager.setBlockHandler(new BlockRequestHandler() {
            // TODO 响应式编程
            // 网关限流了请求，就会调用此回调
            @Override
            public Mono<ServerResponse> handleRequest(ServerWebExchange serverWebExchange, Throwable throwable) {

                R r = R.error(BizCodeEnume.TOO_MANY_REQUEST.getCode(), BizCodeEnume.TOO_MANY_REQUEST.getMessage());
                String jsonString = JSON.toJSONString(r);


                // Mono<String> just = Mono.just(jsonString);
                return  ServerResponse.ok().body(Mono.just(jsonString), String.class);
            }
        });

    }
}
